L = sources D
A source of a Digraph D is a vertex of D that has no parents. That is, v is a source of D if and only if there are only edges pointing from v; none can be pointing into v (there is no edge of the form (v,u)).
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The object sources is a method function.
The source of this document is in /build/reproducible-path/macaulay2-1.25.06+ds/M2/Macaulay2/packages/Graphs.m2:4126:0.